WO2023224525A1 - Équipement utilisateur, nœud réseau et procédés de gestion de blocs de signal de synchronisation dans un réseau de communication sans fil - Google Patents

Équipement utilisateur, nœud réseau et procédés de gestion de blocs de signal de synchronisation dans un réseau de communication sans fil Download PDF

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Publication number
WO2023224525A1
WO2023224525A1 PCT/SE2023/050334 SE2023050334W WO2023224525A1 WO 2023224525 A1 WO2023224525 A1 WO 2023224525A1 SE 2023050334 W SE2023050334 W SE 2023050334W WO 2023224525 A1 WO2023224525 A1 WO 2023224525A1
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Prior art keywords
ssb
subcarriers
skipped
bandwidth
parts
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PCT/SE2023/050334
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English (en)
Inventor
Mohammad MOZAFFARI
Yi-Pin Eric Wang
Kittipong KITTICHOKECHAI
Mehrnaz AFSHANG
Sandeep Narayanan KADAN VEEDU
Zhilan XIONG
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Telefonaktiebolaget Lm Ericsson (Publ)
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Publication of WO2023224525A1 publication Critical patent/WO2023224525A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes

Definitions

  • Embodiments herein relate to a User Equipment (UE), a network node and methods therein. In some aspects, they relate to handling of a Synchronization Signal Block (SSB), in a wireless communications network.
  • UE User Equipment
  • SSB Synchronization Signal Block
  • wireless devices also known as wireless communication devices, mobile stations, stations (STA) and/or User Equipment (UE), communicate via a Wide Area Network or a Local Area Network such as a Wi-Fi network or a cellular network comprising a Radio Access Network (RAN) part and a Core Network (CN) part.
  • RAN Radio Access Network
  • CN Core Network
  • the RAN covers a geographical area which is divided into service areas or cell areas, which may also be referred to as a beam or a beam group, with each service area or cell area being served by a radio network node such as a radio access node e.g., a Wi-Fi access point or a radio base station (RBS), which in some networks may also be denoted, for example, a NodeB, eNodeB (eNB), or gNB as denoted in Fifth Generation (5G) telecommunications.
  • a service area or cell area is a geographical area where radio coverage is provided by the radio network node.
  • the radio network node communicates over an air interface operating on radio frequencies with the wireless device within range of the radio network node.
  • 3GPP is the standardization body for specify the standards for the cellular system evolution, e.g., including 3G, 4G, 5G and the future evolutions.
  • EPS Evolved Packet System
  • 4G Fourth Generation
  • 3GPP 3rd Generation Partnership Project
  • 5G New Radio 5G New Radio
  • Frequency bands for 5G NR are being separated into two different frequency ranges, Frequency Range 1 (FR1) and Frequency Range 2 (FR2).
  • FR1 comprises sub-6 GHz frequency bands. Some of these bands are bands traditionally used by legacy standards but have been extended to cover potential new spectrum offerings from 410 MHz to 7125 MHz.
  • FR2 comprises frequency bands from 24.25 GHz to 52.6 GHz. Bands in this millimeter wave range have shorter range but higher available bandwidth than bands in the FR1.
  • Multi-antenna techniques may significantly increase the data rates and reliability of a wireless communication system.
  • a wireless connection between a single user, such as UE, and a base station the performance is in particular improved if both the transmitter and the receiver are equipped with multiple antennas, which results in a Multiple-Input Multiple-Output (MIMO) communication channel.
  • MIMO Multiple-Input Multiple-Output
  • SU Single-User
  • MIMO enables the users to communicate with the base station simultaneously using the same time-frequency resources by spatially separating the users, which increases further the cell capacity.
  • MU-MIMO Multi-User
  • MU-MIMO may benefit when each UE only has one antenna.
  • Such systems and/or related techniques are commonly referred to as MIMO.
  • a next paradigm shift in processing and manufacturing is the Industry 4.0 in which factories are automated and made much more flexible and dynamic with the help of wireless connectivity.
  • This includes real-time control of robots and machines using time- critical Machine-Type Communication (cMTC) and improved observability, control, and error detection with the help of large numbers of more simple actuators and sensors e.g., Massive Machine-Type Communication (mMTC).
  • cMTC time- critical Machine-Type Communication
  • mMTC Massive Machine-Type Communication
  • URLLC was introduced in 3GPP Release 15 for both LTE and NR, and NR URLLC is further enhanced in Release 16 within the enhanced Ultra Reliable Low Latency Communications (eURLLC) and Industrial loT work items.
  • Narrowband Internet-of-Things NB-loT
  • LTE-MTC Long-Term Evolution for Machine-Type Communication
  • NR was introduced in 3GPP Release 15 and focused mainly on enhanced Mobile Broadband (eMBB) and cMTC.
  • eMBB enhanced Mobile Broadband
  • cMTC enhanced Mobile Broadband
  • LTE-M/NB-loT Low-power Bluetooth
  • URLLC Ultra-Reliable NR devices
  • 3GPP has studied Reduced Capability NR devices (RedCap) in Release 7.
  • the RedCap study item was completed in March 2021.
  • a corresponding RedCap work item was started in December 2020 and is expected to be finalized in September 2022.
  • the RedCap UEs are required to have lower cost, lower complexity, a longer battery life, and potentially a smaller form factor than legacy NR UEs. Therefore, several different complexity reduction features will be specified for RedCap UEs in Release17. These complexity reduction features are listed in the Release 17 work item description (WID) for RedCap. In particular, the reduced maximum UE bandwidth for Release 17 RedCap are as follows:
  • a video surveillance camera deployed outdoors may harvest solar energy.
  • a medical wearable device may be able to harvest energy through vibration and it may be desirable that the patients do not need to replace battery themselves (i.e., battery lasts between office visits).
  • the enhancements can aim at supporting lower UE peak data rate and energy consumption compared to Release 17, while ensuring Release 17 compatibility.
  • a first step in an initial access is that a UE detects DL synchronization reference signals, including Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS). Following that the UE reads a Physical Broadcast Channel (PBCH) which includes a Master Information Block (MIB). Among other information, MIB comprises Physical Downlink Control Channel (PDCCH)-Configured System Information Block 1 (SIB1, PDCCH-ConfigSIB1) which is the configuration of CORESET #0. After decoding CORESETO which is the DL assignment for the remaining system information, the UE can receive the SIB1 , which includes the Random Access Channel (RACH) configuration.
  • PDCCH Physical Downlink Control Channel
  • SIB1 Physical Downlink Control Channel
  • RACH Random Access Channel
  • Random access is the procedure of UE accessing a cell, receiving a unique identification by the cell and receiving the basic radio resource configurations.
  • the steps of four-step random access are as follows:
  • the UE transmits a preamble referred to as Physical Random Access Channel (PRACH) - the Network sends random access response (RAR), indicating reception of preamble and provides time-alignment command,
  • PRACH Physical Random Access Channel
  • RAR random access response
  • the UE sends a PUSCH, a.k.a., Message 3, aiming at resolving collision
  • the Network sends the contention resolution message, a.k.a., Message 4
  • the UE sends the ACK/NACK for Msg4 on the Physical Uplink Control Channel (PUCCH).
  • PUCCH Physical Uplink Control Channel
  • a UE aims at acquiring time and frequency synchronization with a cell and to detect physical layer cell ID (PCI) of the cell.
  • PCI physical layer cell ID
  • the SSB comprises PSS and SSS and PBCH.
  • the UE first aims at detecting PSS and then SSS.
  • Time and frequency synchronization as well as cell ID detection are done using PSS and SSS.
  • Proper detection of PSS and SSS is an essential step for PBCH demodulation.
  • PBCH carries basic system information such as MIB and determines essential parameters for initial access of the cell including the downlink system bandwidth and the system frame number.
  • polar coding and Quadrature Phase Shift Keying (QPSK) modulation are used.
  • the SSB periodicity may be ⁇ 5, 10, 20, 40, 80, 160 ⁇ ms, configured via RRC parameters. However, a default periodicity of 20 ms is assumed during initial cell search.
  • NR supports SS burst set which consists of multiple SSBs confined within a 5 ms window. Depending on the carrier frequency, up to 64 SSBs can be transmitted within a SS burst set.
  • one SSB block occupies 20 contiguous resource blocks which is equivalent to 240 subcarriers, as illustrated in Figure 1.
  • one SSB block spans over four (4) Orthogonal Frequency Division Multiplexing (OFDM) symbols referred to as 11 in Figure 1.
  • OFDM Orthogonal Frequency Division Multiplexing
  • one symbol is for PSS
  • one symbol is for SSS
  • two symbols are for PBCH.
  • PSS occupies the first OFDM symbol of SSB and spans over 127 subcarriers.
  • SSS is located in the third OFDM symbol of SSB and spans over 127 subcarriers.
  • the total number of Resource Elements (REs) used for PBCH transmission per SSB is 576.
  • Table 1 SSB bandwidth for different SCSs.
  • the minimum guardband for each UE channel bandwidth is specified in 3GPP R1-2110385, “RAN1 agreements for Release 17 NR RedCap”, see Table 5.3.3-2 in this documents, and as provided in Table 2.
  • the minimum guardband is applicable only when the SCS 240 kHz SSB is received adjacent to the edge of the UE channel bandwidth within which the SSB is located. That is, a minimum guardband is needed between an SSB (240 kHz SCS) and edges of UE channel bandwidth.
  • Table 2 Minimum guardband (kHz) of SCS 240 kHz SSB.
  • the possible locations of SSB within an NR carrier may be identified based on the synchronization raster.
  • the synchronization raster indicates the possible frequency locations of the SSB which can be used by the UE for system acquisition when explicit signaling of the SSB location is not available.
  • UE bandwidth reduction is identified as one of the important ways to reduce the UE complexity as well as power consumption.
  • BW Release 15 SSB Bandwidth
  • the SSB supports 15 kHz and 30 kHz subcarrier spacing, which corresponds to 3.6 MHz and 7.2 MHz bandwidth, respectively.
  • the SSB supports 120 kHz and 240 kHz subcarrier spacing, which corresponds to 28.8 MHz and 57.6 MHz bandwidth, respectively.
  • the performance of SSB can be degraded when UE BW is less than 7.2 MHz in FR1 or less than 57.6 MHz in FR2.
  • Table 3 below shows different channels/signals which may not be fully supported depending on the UE maximum bandwidth.
  • a UE supporting a 50 MHz maximum bandwidth cannot fully support SSB with 240 kHz SCS.
  • the support of 240 kHz SCS SSB requires satisfying additional guardband requirements, which affects the reception of SSB for reduced BW UEs. Therefore, there is a need for methods to enable a UE with reduced BW to receive SSB which has larger bandwidth than the UE BW, while minimizing the performance degradation.
  • Table 3 Different configurations which are not fully supported due to further UE bandwidth reduction since the channel BW exceeds the UE BW.
  • An object of embodiments herein is improve the way of receiving SSBs for a UE operating with reduced bandwidth in a wireless communications network.
  • the object is achieved by a method performed by a UE for handling a SSB from a network node in a wireless communications network.
  • the UE operates with a reduced bandwidth.
  • the UE detects an SSB from a network node, and that a bandwidth of the SSB is larger than the bandwidth of the UE.
  • the UE determines which part of the SSB to skip to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE, such that the UE is capable to receive the SSB.
  • the part of the SSB to be skipped is determined based on a predicted decoding performance of the SSB.
  • the object is achieved by a method performed by a network node for handling SSBs in a wireless communications network.
  • the network node sends an SSB to a UE.
  • the UE operates with a reduced bandwidth.
  • the SSB comprises unused parts.
  • the network node receives a message from the UE.
  • the message indicates a part or parts of the SSB that are determined to be skipped in order to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE, such that the UE is capable to receive the SSB.
  • the network node prepares a second SSB such that the UE 120 is capable to receive the SSB, based on the indicated part or parts of the SSB that are determined to be skipped and the unused parts of the SSB, such that in the second SSB the unused parts are replaced by the parts of the SSB that was determined to be skipped, making the bandwidth of the second SSB equal or smaller than a bandwidth of a second UE operating with a reduced bandwidth.
  • the network node sends the second SSB to the second UE 122.
  • the object is achieved by a UE configured to handle an SSB from a network node in a wireless communications network.
  • the UE is adapted to operate with a reduced bandwidth.
  • the UE is further configured to:
  • the UE determines which part of the SSB to skip to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE, such that the UE is capable to receive the SSB, wherein the part of the SSB to be skipped is adapted to be determined based on a predicted decoding performance of the SSB.
  • the object is achieved by a network node configured to handle SSBs in a wireless communications network.
  • the network node is further configured to:
  • - send an SSB to a UE, which UE is adapted to operate with a reduced bandwidth, which SSB comprises unused parts, - when a bandwidth of the SSB is larger than the bandwidth of the UE, receive a message from the UE, which message is adapted to indicate a part or parts of the SSB that are determined to be skipped in order to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE, such that the UE is capable to receive the SSB,
  • - prepare a second SSB such that the UE 120 is capable to receive the SSB, based on the indicated part or parts of the SSB that are determined to be skipped and the unused parts of the SSB, such that in the second SSB the unused parts are replaced by the parts of the SSB that was determined to be skipped, making the bandwidth of the second SSB equal or smaller than a bandwidth of a second UE operating with a reduced bandwidth, and
  • the UE has determined which part of the SSB to skip based on a predicted decoding performance of the SSB, which will make the bandwidth of the SSB equal or smaller than the bandwidth of the UE, the UE will be capable to receive the SSB. In this way an SSB with a bandwidth that is larger than the bandwidth of the UE can be received by the UE while minimizing the performance degradation. This results in an improved way of receiving SSBs for the UE operating with reduced bandwidth in the wireless communications network.
  • Figure 1 is a schematic block diagram illustrating prior art.
  • Figure 2 is a schematic block diagram illustrating embodiments of a wireless communications network.
  • Figure 3 is a flowchart depicting an embodiment of a method in a UE.
  • Figure 4 is a flowchart depicting an embodiment of a method in a network node.
  • Figure 5 is a schematic block diagram illustrating embodiments herein.
  • Figure 6 is a schematic block diagram illustrating embodiments herein.
  • Figure 7 is a schematic block diagram illustrating embodiments herein.
  • Figure 8a-b are schematic block diagrams illustrating embodiments of a network node.
  • Figure 9a-b are schematic block diagrams illustrating embodiments of a gateway device.
  • Figure 10 schematically illustrates a telecommunication network connected via an intermediate network to a host computer.
  • Figure 11 is a generalized block diagram of a host computer communicating via a base station with a user equipment over a partially wireless connection.
  • Figures 12-15 are flowcharts illustrating methods implemented in a communication system including a host computer, a base station and a user equipment.
  • Embodiments herein relate to SSBs for reduced bandwidth UEs.
  • Embodiments herein provide effective mechanisms that enable a UE such as a reduced bandwidth UE to receive an SSB which is larger than the UE receiver bandwidth.
  • some examples of the provided methods determine the portion of an SSB which shall be skipped at the UE while ensuring a minimum impact on the PSS/SSS/PBCH decoding performance.
  • some embodiments herein provide techniques for compensating any loss that reduced bandwidth UE, also referred to as a reduced BW UE herein, may experience when receiving an SSB exceeding the UE bandwidth.
  • Embodiments provided herein enable a reduced BW UE to effectively receive an SSB whose bandwidth exceeds the UE BW.
  • the provided schemes of example embodiments herein ensure the minimum impact on detecting the SSB by identifying suitable SSB subcarriers which preferably should be skipped at the receiver.
  • Techniques according to embodiments herein are particularly useful when the SSB is shared between legacy UEs and reduced BW UEs.
  • embodiments herein are beneficial for network resource utilization and SSB decoding performance for reduced BW UEs. Examples of embodiments herein are important for supporting ultra-low cost, low power, and low complexity devices, also referred to as UEs, in 5G evolution towards 6G.
  • FIG. 2 is a schematic overview depicting a wireless communications network 100 wherein embodiments herein may be implemented.
  • the wireless communications network 100 comprises one or more RANs and one or more CNs.
  • the wireless communications network 100 may use 5G NR but may further use a number of other different technologies, such as, 6G, Wi-Fi, (LTE), LTE-Advanced, Wideband Code Division Multiple Access (WCDMA), Global System for Mobile communications/enhanced Data rate for GSM Evolution (GSM/EDGE), or Ultra Mobile Broadband (UMB), just to mention a few possible implementations.
  • 6G Wi-Fi
  • LTE-Fi Long Term Evolution
  • WCDMA Wideband Code Division Multiple Access
  • GSM/EDGE Global System for Mobile communications/enhanced Data rate for GSM Evolution
  • UMB Ultra Mobile Broadband
  • Network nodes such as a network node 110, operate in the wireless communications network 100.
  • the network node 110 e.g. provides a number of cells and may use these cells for communicating with e.g. a UE 120 and/or a second UE 122.
  • the network node 110 may be a transmission and reception point e.g. a radio access network node such as a base station, e.g.
  • a radio base station such as a NodeB, an evolved Node B (eNB, eNodeB, eNode B), an NR Node B (gNB), a base transceiver station, a radio remote unit, an Access Point Base Station, a base station router, a transmission arrangement of a radio base station, a stand-alone access point, a Wireless Local Area Network (WLAN) access point, an Access Point Station (AP ST A), an access controller, a UE acting as an access point or a peer in a Device to Device (D2D) communication, or any other network unit capable of communicating with a UE served by the network node 110 depending e.g. on the radio access technology and terminology used.
  • the network node 110 may further be able to control, e.g. schedule, communication on a number of SL beams between UEs, e.g. the UE 120 and the second UE 122.
  • UEs operate in the wireless communications network 100, such as e.g. a UE 120 and/or a second UE 122.
  • the UE 120 and the second UE 122 may operate with a reduced bandwidth and may be referred to as reduced BW UEs herein. Any one or both of the UE 120 and the second UE 122 may respectively e.g.
  • NR device an NR device, a mobile station, a wireless terminal, an NB-loT device, an enhanced Machine Type Communication (eMTC) device, an NR RedCap device, a CAT-M device, a Vehicle-to- everything (V2X) device, Vehicle-to-Vehicle (V2V) device, a Vehicle-to-Pedestrian (V2P) device, a Vehicle-to-lnfrastructure (V2I) device, and a Vehicle-to-Network (V2N) device, a Wi-Fi device, an LTE device and a non-access point (non-AP) STA, a STA, that communicates via a base station such as e.g.
  • a base station such as e.g.
  • the network node 110 one or more Access Networks (AN), e.g. RAN, to one or more core networks (CN).
  • AN Access Networks
  • CN core networks
  • the UE relates to a non-limiting term which means any UE, terminal, wireless communication terminal, user equipment, (D2D) terminal, or node e.g. smart phone, laptop, mobile phone, sensor, relay, mobile tablets or even a small base station communicating within a cell.
  • D2D user equipment
  • Methods herein may in one aspect be performed by the UE 120, in another aspect by the network node 110.
  • a Distributed Node (DN) and functionality e.g. comprised in a cloud 135 as shown in Figure 2, may be used for performing or partly performing the methods of embodiments herein.
  • reduced BW UEs such as the UE 120
  • Embodiments herein enable the UE 120 to efficiently skip a portion of SSB which has a minimum impact on the SSB decoding performance.
  • the network may also effectively support legacy UEs and reduced BW UEs such as e.g. the second UE 122, using a shared SSB which is beneficial from resource utilization perspective.
  • the UE 120 when the bandwidth of SSB is larger than the UE 120 bandwidth, the UE 120 efficiently determines which part of SSB to skip, also referred to as omit or puncture, such that the impact on the decoding is minimized, i.e., minimizing the performance loss.
  • This scenario is particularly advantageous for supporting UEs with reduced bandwidth also referred to as reduced capability, which may not fully receive the transmitted signal from the network node 110.
  • Figure 3 shows example embodiments of a method performed by the UE 120.
  • the method is for handling an SSB from the network node 110 in the wireless communications network 100.
  • the UE 120 operates with a reduced bandwidth. This means that UE 120 is a reduced bandwidth UE.
  • the reduced bandwidth may e.g., comprise MHz or 3 MHz in FR1, and 50 MHz or 40 MHz in FR2.
  • the method comprises the following actions, which actions may be taken in any suitable order.
  • Optional actions are referred to as dashed boxes in Figure 3.
  • Action 301
  • the UE 120 detects an SSB from the network node 110.
  • the UE 120 further detects that a bandwidth of the SSB is larger than the bandwidth of the UE 120. This may be determined by pre-defined and/or known bandwidth and Subcarrier Spacing (SCS) of the SSB.
  • SCS Subcarrier Spacing
  • the UE 120 knows that the bandwidth of SSB may be 3.6 MHz or 7.2 MHz and it may compare with its maximum bandwidth.
  • the UE 120 is not capable to receive the SSB since it is too large. However, if the UE 120 according to embodiments herein, reduces the SSB by skipping a part of it which then not will be received or decoded, the UE 120 will be capable to receive the reduced SSB. See below actions.
  • the UE 120 determines which part of the SSB to skip to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE 120, such that the UE 120 is capable to receive the SSB. It should be noted that the UE 120 may determine which part of the SSB to skip by obtaining the determined part of the SSB to skip from a network node or a distributed node.
  • the UE 120 is capable to receive the SSB if the bandwidth of the SSB is equal or smaller than the bandwidth of the UE 120.
  • the wording “skip a part of the SSB to be received” when used herein means that the UE 120 ignores, punctures, or not receives that part of SSB and only decodes the remaining parts.
  • the part of the SSB to be skipped is determined based on a predicted decoding performance of the SSB.
  • the UE 120 will not just skip any part of the SSB, the UE 120 will consider the predicted decoding performance of the SSB.
  • the UE 120 may then determine to skip the part that affects the predicted decoding performance as little as possible and, in this way, receive the part of the SSB that gives the best decoding performance. This will be explained more in detail below.
  • the decoding performance of the SSB is predicted based on any one or more out of: an error probability of the decoding, parameters and configuration related to the SSB, e.g., frequency location, periodicity, etc., battery life of the UE 120, UE 120 performance requirements, and UE 120 capabilities.
  • this may comprise that the determining of which part of the SSB to be skipped is performed such that the predicted decoding of the SSB achieves a performance that is any one out of:
  • the UE 120 determines which part of the SSB to be skipped by determining which part or parts of the SSB to be skipped. This means that the part of the SSB to be skipped comprises one or more parts.
  • the UE 120 may e.g., determine different parts of the SSB to be skipped.
  • the part or parts of the SSB to be skipped may comprise any one out of:
  • the parts of the SSB to be skipped comprises the first q L subcarriers and the last q R subcarriers of the SSB, wherein:
  • the part of the SSB to be skipped is determined such that any one or more out of a PSS, an SSS, and a PBCH, comprised in the SSB are least affected or not affected.
  • determining which part of the SSB to skip and receive the rest of the parts of the SSB may also cover determining which part of the SSB to receive and skip the rest of the parts of the SSB.
  • the UE 120 may send a message to the network node 110.
  • the message indicates the part or parts of the SSB that are determined to be skipped in order to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE 120, such that the UE 120 is capable to receive the SSB.
  • the network node 110 may use this information when sending SSBs to other UEs.
  • subsequent SSBs from the network node 110 are detected in a periodicity comprising a time interval.
  • the UE 120 changes the skipped part or parts of the subsequent SSBs within the time interval, so that the skipped part or parts of the SSB in some or all of the subframes are non-overlapping or partially overlapping. This makes it possible for the UE 120 to receive different parts of the SSB at different times which may be combined and construct the entire SSB.
  • the UE 120 When the UE 120 has skipped the determined part of the SSB and made the bandwidth of the SSB equal or smaller than the bandwidth of the UE 120, the UE 120 is capable of receiving it. The UE 120 may then receive the SSB in which the determined part or parts are skipped.
  • Figure 4 shows example embodiments of a method performed by the network node 110 for handling SSBs in the wireless communications network 100.
  • the method comprises the following actions, which actions may be taken in any suitable order.
  • Optional actions are referred to as dashed boxes in Figure 4.
  • the network node 110 sends an SSB to the UE 120.
  • the SSB comprises unused parts.
  • the UE 120 operates with a reduced bandwidth.
  • Unused parts of the SSB means REs which are not used for any data transmissions and are allocated with zero power when transmitting a typical SSB.
  • the SSB will be detected by the UE 120 as described above.
  • the network node 110 receives a message from the UE 120.
  • the message is received when a bandwidth of the SSB is larger than the bandwidth of the UE 120.
  • the message indicates a part or parts of the SSB that are determined to be skipped in order to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE 120, such that the UE 120 is capable to receive the SSB.
  • the part or parts of the SSB to be skipped comprises any one out of:
  • the parts of the SSB to be skipped comprises the first q L subcarriers and the last q R subcarriers of the SSB, wherein:
  • the network node 110 prepares a second SSB such that the second UE 122 is capable to receive the SSB. This is an SSB for another UE, the second UE 122.
  • the network node 120 will learn from the skipped part of the earlier SSB to the UE 120, to adapt the second SSB for the second UE 122 which also operates with a reduced bandwidth.
  • the second SSB is prepared based on the indicated part or parts of the SSB that are determined to be skipped and the unused parts of the SSB.
  • the second SSB is prepared such that in the second SSB the unused parts are replaced by the parts of the SSB that was determined to be skipped. This will make the bandwidth of the second SSB equal or smaller than a bandwidth of the second UE 122.
  • the second UE 122 operates with a reduced bandwidth.
  • the network node 110 sends the second SSB to the second UE 122.
  • the reduced BW UEs such as the UE 120
  • Figure 5 illustrates an SSB of 20 RBs, exceeding the UE 120 bandwidth.
  • the UE 120 bandwidth is referred to as UE BW in the figure.
  • the UE 120 operating with a reduced bandwidth may still recover most of the data of the SSB by not receiving all parts, e.g. all subcarriers, of the SSB according to embodiments herein. Specifically, at high SNRs the SSB decoding probability may still be high despite skipping, e.g. loosing, a part or parts, e.g. several REs of the SSB.
  • Some first embodiments of efficient skipping or puncturing a part of the SSB are described.
  • the UE 1200 will determine 302 which part of the SSB to skip to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE 120, such that the UE 120 is capable to receive the SSB. From the UE 120 point of view this may mean that, if the UE 120 cannot receive the full SSB because of its reduced BW, it may determine to receive e.g. the part of the SSB which gives the best decoding performance.
  • the UE 120 may choose to receive parts such as a set of resources, at Resource Blocks (RBs) and/or subcarriers of the SSB, at the receiver of the UE 120, less than the resources used by the SSB and skip a part comprising the rest of resources.
  • RBs Resource Blocks
  • Such skipping of a part of the SSB may be done at subcarrier-level and/or RB-level at the SSB.
  • the goal is to identify, also referred to as identify, which resources to skip and which resources to be received in order to ensure a minimum performance loss in the SSB decoding.
  • B u be the effective bandwidth, excluding any guardband if needed
  • S u be the number of subcarriers of the UE 120.
  • B c and S c be the bandwidth and number of subcarriers of the SSB.
  • B u ⁇ B c the UE 120 needs to skip a number of subcarriers of the SSB but receive the rest.
  • the number of skipped subcarriers is (S c - S u ).
  • the UE 120 may in some embodiments, determine to receive contiguous RBs. Hence, one part of the SSB comprising subcarriers on the high edge, i.e., subcarriers with high indices, and/or one part of the SSB comprising subcarriers on low edge, i.e., subcarriers with low indices, may be determined to be skipped, i.e. not received by the reduced BW UE 120.
  • q be the part of the SSB to skip, comprising the total number of subcarriers per OFDM symbol of the SSB which need to be skipped at the receiver.
  • the value q is determined based on the UE 120 BW, the SSB BW, and any guardband which may be required for receiving SSB, see Table 2 for example.
  • the total number of skipped SSB subcarriers should be at least:
  • B u [kHz q ceil (240 — SCS ssb [kHz] ) where ceil (.) is the ceiling function, and SCS ssb is the SSB subcarrier spacing.
  • a ceiling function when used herein e.g. means it gives the smallest nearest integer that is greater than or equal to the specified value.
  • the UE 120 may consider at least one of the following options:
  • the first q subcarriers (lowest indices) of the SSB are skipped.
  • the values of q L and q R are properly determined by the UE 120 to ensure a minimum SSB decoding performance loss.
  • the UE 120 determines to receive resources within the bandwidth of the SSB, such that it can decode the SSB with acceptable performance, e.g. relating to error probability. This error probability may be determined by the UE 120 performance requirement, e.g., specified in the standards, or the UE 120 may determine by itself, e.g., based on service, battery life, etc., requirements.
  • PSS and SSS are least affected, and preferably not affected.
  • the minimum number of used SSB subcarriers should be skipped.
  • the following rules may be used by the UE 120, e.g. at the receiver of the UE 120:
  • the UE 120 receiver may skip subcarriers from the low edge, e.g. low index subcarriers, high edge, e.g. high index subcarriers, or both edges.
  • the UE 120 receiver may skip subcarriers from the low edge or from the high edge.
  • the UE 120 receiver may skip subcarriers from the high edge.
  • the UE 120 receiver may skip up to 57 subcarriers from high edge, and remaining (up to 56) subcarriers from low edge to avoid impact on PSS/SSS. In particular, to ensure that the minimum number of used subcarriers are skipped, the receiver can skip 57 subcarriers from the high edge and (q - 57) subcarriers from the low edge.
  • the UE 120 receiver may skip at least 57 subcarriers from high edge, and at least 56 subcarriers from the low edge.
  • the above rules ensure a minimum impact on PSS/SSS, as well as on PBCH by minimizing the number of used subcarriers which are skipped, i.e., unused subcarriers are skipped when possible.
  • the determining of which part comprising subcarriers of the SSB to skip is performed such that the detected and/or received PSS and/or SSS of the SSB is centered in the frequency domain with respect to the UE 120 bandwidth.
  • the value of B u and q may be adapted according to the coverage condition. If the UE 120 is in good coverage condition, an aggressive subcarrier skipping might not affect the performance of SSB detection.
  • An aggressive subcarrier skipping when used herein may mean a simple puncturing approach, i.e., without optimization, that may result in relatively high performance loss. It should be noted that the path loss in a cell may vary by approximately 80-100 dB. Thus, an aggressive subcarrier skipping is feasible for most of the UEs such as e.g. the UE 120, in a cell.
  • some part of a transmitted SSB may not be received. From UE 120 perspective, this part may be considered as skipped, also referred to as punctured and corresponds to some punctured bit positions of an output of a rate matching for polar code. This means that the bits have zero values. This is an advantage since it simplifies the decoding process for the UE 120.
  • the BW limited UE 120 may perform an insertion of zeros as soft values, i.e., Log-Likelihood Ratios (LLRs), before sending the LLRs to the polar decoder, for both the corresponding positions of the bits punctured at the output of the polar encoder (for rate matching), and the corresponding positions that the UE 120 skipped receiving.
  • LLRs Log-Likelihood Ratios
  • the insertion of zero soft-bit values may be performed in all or some of the positions corresponding to the punctured REs of the SSB, i.e. the parts that are not received by the UE 120.
  • the network node 110 utilizes the unused REs of an SSB to facilitate SSB reception by reduced-BW UEs such as the second UE 122.
  • reduced-BW UEs such as the second UE 122.
  • both legacy UEs and reduced-bandwidth UEs may receive full SSB information but additional time-frequency resources are needed for SSB transmission no matter whether there are reduced-bandwidth UEs or not.
  • Figure 7 illustrates utilizing unused SSB REs for reduced bandwidth UEs for receiving SSB.
  • the part comprising REs skipped by the UE 120 is copied 710 by the network node 110 and pasted 720 into unused REs for reduced-BW UEs such as the second UE 122.
  • the network node 110 utilizes the REs which are not in the existing SSB to facilitate SSB reception by reduced-BW UEs, for example REs or partial REs in a first symbol after a legacy SSB.
  • the mapping of the skipped REs and the new used REs for reduced-BW UEs such as the second UE 122 may be pre-defined at both network and UE sides.
  • the SSB periodicity may be any of ⁇ 5, 10, 20, 40, 80, 160 ⁇ ms.
  • the contents of MIB carried by PBCH in the SSB is expected to be the same over an 80 ms time interval, i.e., over 8 subframes. Due to this reason, PBCH blocks transmitted in different subframes within this 80 ms interval may be jointly decoded to achieve a better performance. This is since different copies of the SSB may be received in different time instances and jointly combined and decoded. To be jointly decoded means that decoding is done in multiple time instances, i.e., accumulating information for better decoding performance.
  • the UE 120 may change the skipped subcarriers of SSB within e.g., 80 ms interval, so that the skipped portions of the SSB in some or all of the subframes are non-overlapping or partially overlapping. This means that different portions of the SSB are decoded in different times which overall is equivalent to receiving the entire SSB thus preventing the performance loss. Note that this may require retuning of the UE’s 120 center frequency in certain subframes to receive different portions of the SSB, if B u ⁇ B c .
  • the transmission gap may be needed to support frequency hopping, so the network node 110 needs to know whether the UE 120 supports wider bandwidth or frequency hopping for SSB detection. In this case, a UE 120 capability report is needed. The UE 120 may report its capability of frequency hopping for SSB detection to the network node 110. The transmission gap to support frequency hopping may be needed.
  • the UE 120 performs RF retuning to decode different parts of SSB in multiple stages. For example, in a first stage SSS and/or PSS part of the SSB is decoded and in later stages other parts of SSB will be decoded. Moreover, some parts of SSB may be decoded multiple times to improve the detection performance. The UE 120 may also determine to skip a part of the SSB to minimize the required RF retuning.
  • the UE 120 is configured to handle an SSB from the network node 110 in the wireless communications network 100.
  • the UE 120 is adapted to operate with a reduced bandwidth.
  • the UE 120 may comprise an arrangement depicted in Figures 8a and 8b.
  • the UE 120 may comprise an input and output interface 800 configured to communicate in the wireless communication network 100, e.g., with the network node 110.
  • the input and output interface 800 may comprise a wireless receiver (not shown) and a wireless transmitter (not shown).
  • the UE 120 may further be configured to, e.g. by means of a detecting unit 801 in the UE 120, detect an SSB from the network node 110, and that a bandwidth of the SSB is larger than the bandwidth of the UE 120.
  • the UE 120 may further be configured to, e.g. by means of a determining unit 802 in the UE 120, determine which part of the SSB to skip to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE 120, such that the UE 120 is capable to receive the SSB.
  • the part of the SSB to be skipped is adapted to be determined based on a predicted decoding performance of the SSB.
  • the UE 120 may further be configured to, e.g. by means of the determining unit 802 in the UE 120, determine which part of the SSB to be skipped such that the predicted decoding of the SSB achieves a performance that is any one out of:
  • the UE 120 may further be configured to, e.g. by means of the determining unit 802 in the UE 120, determine which part of the SSB to be skipped by: determining which part or parts of the SSB to be skipped, and wherein the part or parts of the SSB to be skipped is/are adapted to comprise any one out of:
  • decoding performance of the SSB is adapted to be predicted based on any one or more out of: an error probability of the decoding, parameters and configuration related to the SSB, battery life of the UE 120, UE 120 performance requirements and UE 120 capabilities.
  • the parts of the SSB to be skipped are adapted to comprise the first q L subcarriers and the last q R subcarriers of the SSB, wherein:
  • the other half of the subcarriers to be skipped are adapted to be comprised in the last q R subcarriers of the SSB.
  • the part of the SSB to be skipped is adapted to be determined such that any one or more out of a PSS, an SSS, and a PBCH, comprised in the SSB are least affected or not affected.
  • the UE 120 may further be configured to, e.g. by means of a sending unit 803 in the UE 120, send a message to the network node 110, which message is adapted to indicate the part or parts of the SSB that are determined to be skipped in order to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE 120, such that the UE 120 is capable to receive the SSB.
  • subsequent SSBs from the network node 110 are adapted to be detected in a periodicity comprising a time interval.
  • the UE 120 may further be configured to, e.g. by means of a changing unit 804 in the UE 120, change the skipped part or parts of the subsequent SSBs within the time interval, so that the skipped part or parts of the SSB in some or all of the subframes are non-overlapping or partially overlapping.
  • the UE 120 may further be configured to, e.g. by means of a receiving unit 805 in the UE 120, receive SSB in which the determined part or parts are skipped.
  • the embodiments herein may be implemented through a respective processor or one or more processors, such as the processor 860 of a processing circuitry in the UE 120 depicted in Figure 8a, together with respective computer program code for performing the functions and actions of the embodiments herein.
  • the program code mentioned above may also be provided as a computer program product, for instance in the form of a data carrier carrying computer program code for performing the embodiments herein when being loaded into the UE 120.
  • One such carrier may be in the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick.
  • the computer program code may furthermore be provided as pure program code on a server and downloaded to the UE 120.
  • the UE 120 may further comprise a memory 870 comprising one or more memory units.
  • the memory 870 comprises instructions executable by the processor in UE 120.
  • the memory 870 is arranged to be used to store e.g. information, indications, data, configurations, SSBs I part(s) of SSBs, messages, and applications to perform the methods herein when being executed in the UE 120.
  • a computer program 880 comprises instructions, which when executed by the respective at least one processor 860, cause the at least one processor of the UE 120 to perform the actions above.
  • a respective carrier 890 comprises the respective computer program 880, wherein the carrier 890 is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer-readable storage medium.
  • the units in the UE 120 described above may refer to a combination of analog and digital circuits, and/or one or more processors configured with software and/or firmware, e.g. stored in the UE 120, that when executed by the respective one or more processors such as the processors described above.
  • processors as well as the other digital hardware, may be included in a single Application-Specific Integrated Circuitry ASIC, or several processors and various digital hardware may be distributed among several separate components, whether individually packaged or assembled into a system-on-a-chip SoC.
  • the network node 110 is configured to handle SSBs in a wireless communications network 100.
  • the network node 110 may comprise an arrangement depicted in Figures 9a and 9b.
  • the network node 110 may comprise an input and output interface 900 configured to communicate in the wireless communication network 100, e.g., with the UE 120.
  • the input and output interface 900 may comprise a wireless receiver (not shown) and a wireless transmitter (not shown).
  • the network node 110 may further be configured to, e.g. by means of a sending unit 901 in the network node 110, send an SSB to the UE 120.
  • the UE 120 is adapted to operate with a reduced bandwidth.
  • the SSB comprises unused parts
  • the network node 110 may further be configured to, e.g. by means of a receiving unit 902 in the network node 110, when a bandwidth of the SSB is larger than the bandwidth of the UE 120, receive a message from the UE 120.
  • the message is adapted to indicate a part or parts of the SSB that are determined to be skipped in order to make the bandwidth of the SSB equal or smaller than the bandwidth of the UE 120, such that the UE 120 is capable to receive the SSB.
  • the network node 110 may further be configured to, e.g. by means of a preparing unit 903 in the network node 110, a second SSB such that the UE 120 is capable of receiving the SSB, based on the indicated part or parts of the SSB that are determined to be skipped and the unused parts of the SSB, such that in the second SSB the unused parts are replaced by the parts of the SSB that was determined to be skipped, making the bandwidth of the second SSB equal or smaller than a bandwidth of a second UE 122 operating with a reduced bandwidth.
  • the network node 110 may further be configured to, e.g. by means of the sending unit 901 in the network node 110, send the second SSB to the second UE 122.
  • the part or parts of the SSB to be skipped is/are adapted to comprise any one out of:
  • the parts of the SSB to be skipped are adapted to comprise the first q L subcarriers and the last q R subcarriers of the SSB, wherein:
  • the other half of the subcarriers to be skipped are adapted to be comprised in the last q R subcarriers of the SSB.
  • the embodiments herein may be implemented through a respective processor or one or more processors, such as the processor 960 of a processing circuitry in the network node 110 depicted in Figure 9a, together with respective computer program code for performing the functions and actions of the embodiments herein.
  • the program code mentioned above may also be provided as a computer program product, for instance in the form of a data carrier carrying computer program code for performing the embodiments herein when being loaded into the network node 110.
  • One such carrier may be in the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick.
  • the computer program code may furthermore be provided as pure program code on a server and downloaded to the network node 110.
  • the network node 110 may further comprise a memory 970 comprising one or more memory units.
  • the memory 970 comprises instructions executable by the processor in network node 110.
  • the memory 970 is arranged to be used to store e.g., information, indications, data, configurations, SSBs I part(s) of SSBs, messages, and applications to perform the methods herein when being executed in the network node 110.
  • a computer program 980 comprises instructions, which when executed by the respective at least one processor 960, cause the at least one processor of the network node 110 to perform the actions above.
  • a respective carrier 990 comprises the respective computer program 980, wherein the carrier 990 is one of an electronic signal, an optical signal, an electromagnetic signal, a magnetic signal, an electric signal, a radio signal, a microwave signal, or a computer-readable storage medium.
  • the units in the network node 110 described above may refer to a combination of analog and digital circuits, and/or one or more processors configured with software and/or firmware, e.g. stored in the network node 110, that when executed by the respective one or more processors such as the processors described above.
  • processors as well as the other digital hardware, may be included in a single Application-Specific Integrated Circuitry ASIC, or several processors and various digital hardware may be distributed among several separate components, whether individually packaged or assembled into a system-on-a- chip SoC.
  • a communication system includes a telecommunication network 3210, such as a 3GPP-type cellular network, e.g. wireless communications network 100, which comprises an access network 3211 , such as a radio access network, and a core network 3214.
  • the access network 3211 comprises a plurality of base stations 3212a, 3212b, 3212c, such as AP STAs NBs, eNBs, gNBs or other types of wireless access points, each defining a corresponding coverage area 3213a, 3213b, 3213c.
  • Each base station 3212a, 3212b, 3212c e.g.
  • a first user equipment e.g. the UE 120, such as a Non-AP STA 3291 located in coverage area 3213c is configured to wirelessly connect to, or be paged by, the corresponding base station 3212c.
  • a second UE 3292 e.g. the second UE 122, such as a Non-AP STA in coverage area 3213a is wirelessly connectable to the corresponding base station 3212a. While a plurality of UEs 3291 , 3292 are illustrated in this example, the disclosed embodiments are equally applicable to a situation where a sole UE is in the coverage area or where a sole UE is connecting to the corresponding base station 3212.
  • the telecommunication network 3210 is itself connected to a host computer 3230, which may be embodied in the hardware and/or software of a standalone server, a cloud- implemented server, a distributed server or as processing resources in a server farm.
  • the host computer 3230 may be under the ownership or control of a service provider, or may be operated by the service provider or on behalf of the service provider.
  • the connections 3221 , 3222 between the telecommunication network 3210 and the host computer 3230 may extend directly from the core network 3214 to the host computer 3230 or may go via an optional intermediate network 3220.
  • the intermediate network 3220 may be one of, or a combination of more than one of, a public, private or hosted network; the intermediate network 3220, if any, may be a backbone network or the Internet; in particular, the intermediate network 3220 may comprise two or more sub-networks (not shown).
  • the communication system of Figure 10 as a whole enables connectivity between one of the connected UEs 3291 , 3292 and the host computer 3230.
  • the connectivity may be described as an over-the-top (OTT) connection 3250.
  • the host computer 3230 and the connected UEs 3291 , 3292 are configured to communicate data and/or signaling via the OTT connection 3250, using the access network 3211 , the core network 3214, any intermediate network 3220 and possible further infrastructure (not shown) as intermediaries.
  • the OTT connection 3250 may be transparent in the sense that the participating communication devices through which the OTT connection 3250 passes are unaware of routing of uplink and downlink communications.
  • a base station 3212 may not or need not be informed about the past routing of an incoming downlink communication with data originating from a host computer 3230 to be forwarded (e.g., handed over) to a connected UE 3291. Similarly, the base station 3212 need not be aware of the future routing of an outgoing uplink communication originating from the UE 3291 towards the host computer 3230.
  • a host computer 3310 comprises hardware 3315 including a communication interface 3316 configured to set up and maintain a wired or wireless connection with an interface of a different communication device of the communication system 3300.
  • the host computer 3310 further comprises processing circuitry 3318, which may have storage and/or processing capabilities.
  • the processing circuitry 3318 may comprise one or more programmable processors, application-specific integrated circuits, field programmable gate arrays or combinations of these (not shown) adapted to execute instructions.
  • the host computer 3310 further comprises software 3311 , which is stored in or accessible by the host computer 3310 and executable by the processing circuitry 3318.
  • the software 3311 includes a host application 3312.
  • the host application 3312 may be operable to provide a service to a remote user, such as a UE 3330 connecting via an OTT connection 3350 terminating at the UE 3330 and the host computer 3310. In providing the service to the remote user, the host application 3312 may provide user data which is transmitted using the OTT connection 3350.
  • the communication system 3300 further includes a base station 3320 provided in a telecommunication system and comprising hardware 3325 enabling it to communicate with the host computer 3310 and with the UE 3330.
  • the hardware 3325 may include a communication interface 3326 for setting up and maintaining a wired or wireless connection with an interface of a different communication device of the communication system 3300, as well as a radio interface 3327 for setting up and maintaining at least a wireless connection 3370 with a UE 3330 located in a coverage area (not shown in Figure 11) served by the base station 3320.
  • the communication interface 3326 may be configured to facilitate a connection 3360 to the host computer 3310.
  • connection 3360 may be direct or it may pass through a core network (not shown in Figure 11) of the telecommunication system and/or through one or more intermediate networks outside the telecommunication system.
  • the hardware 3325 of the base station 3320 further includes processing circuitry 3328, which may comprise one or more programmable processors, application-specific integrated circuits, field programmable gate arrays or combinations of these (not shown) adapted to execute instructions.
  • the base station 3320 further has software 3321 stored internally or accessible via an external connection.
  • the communication system 3300 further includes the UE 3330 already referred to.
  • Its hardware 3335 may include a radio interface 3337 configured to set up and maintain a wireless connection 3370 with a base station serving a coverage area in which the UE 3330 is currently located.
  • the hardware 3335 of the UE 3330 further includes processing circuitry 3338, which may comprise one or more programmable processors, applicationspecific integrated circuits, field programmable gate arrays or combinations of these (not shown) adapted to execute instructions.
  • the UE 3330 further comprises software 3331 , which is stored in or accessible by the UE 3330 and executable by the processing circuitry 3338.
  • the software 3331 includes a client application 3332.
  • the client application 3332 may be operable to provide a service to a human or non-human user via the UE 3330, with the support of the host computer 3310.
  • an executing host application 3312 may communicate with the executing client application 3332 via the OTT connection 3350 terminating at the UE 3330 and the host computer 3310.
  • the client application 3332 may receive request data from the host application 3312 and provide user data in response to the request data.
  • the OTT connection 3350 may transfer both the request data and the user data.
  • the client application 3332 may interact with the user to generate the user data that it provides.
  • the host computer 3310, base station 3320 and UE 3330 illustrated in Figure 11 may be identical to the host computer 3230, one of the base stations 3212a, 3212b, 3212c and one of the UEs 3291 , 3292 of Figure 10, respectively.
  • the inner workings of these entities may be as shown in Figure 11 and independently, the surrounding network topology may be that of Figure 10.
  • the OTT connection 3350 has been drawn abstractly to illustrate the communication between the host computer 3310 and the use equipment 3330 via the base station 3320, without explicit reference to any intermediary devices and the precise routing of messages via these devices.
  • Network infrastructure may determine the routing, which it may be configured to hide from the UE 3330 or from the service provider operating the host computer 3310, or both. While the OTT connection 3350 is active, the network infrastructure may further take decisions by which it dynamically changes the routing (e.g., on the basis of load balancing consideration or reconfiguration of the network).
  • the wireless connection 3370 between the UE 3330 and the base station 3320 is in accordance with the teachings of the embodiments described throughout this disclosure.
  • One or more of the various embodiments improve the performance of OTT services provided to the UE 3330 using the OTT connection 3350, in which the wireless connection 3370 forms the last segment. More precisely, the teachings of these embodiments may improve the RAN effect: data rate, latency, power consumption and thereby provide benefits such as e.g. the applicable corresponding effect on the OTT service: reduced user waiting time, relaxed restriction on file size, better responsiveness, extended battery lifetime.
  • a measurement procedure may be provided for the purpose of monitoring data rate, latency and other factors on which the one or more embodiments improve.
  • the measurement procedure and/or the network functionality for reconfiguring the OTT connection 3350 may be implemented in the software 3311 of the host computer 3310 or in the software 3331 of the UE 3330, or both.
  • sensors (not shown) may be deployed in or in association with communication devices through which the OTT connection 3350 passes; the sensors may participate in the measurement procedure by supplying values of the monitored quantities exemplified above, or supplying values of other physical quantities from which software 3311 , 3331 may compute or estimate the monitored quantities.
  • the reconfiguring of the OTT connection 3350 may include message format, retransmission settings, preferred routing etc.; the reconfiguring need not affect the base station 3320, and it may be unknown or imperceptible to the base station 3320. Such procedures and functionalities may be known and practiced in the art.
  • measurements may involve proprietary UE signaling facilitating the host computer’s 3310 measurements of throughput, propagation times, latency and the like.
  • the measurements may be implemented in that the software 3311 , 3331 causes messages to be transmitted, in particular empty or ‘dummy’ messages, using the OTT connection 3350 while it monitors propagation times, errors etc.
  • FIG 12 is a flowchart illustrating a method implemented in a communication system, in accordance with one embodiment.
  • the communication system includes a host computer, a base station such as an AP STA, and a UE such as a Non-AP STA which may be those described with reference to Figure 11 and Figure 10.
  • a host computer provides user data.
  • the host computer provides the user data by executing a host application.
  • the host computer initiates a transmission carrying the user data to the UE.
  • the base station transmits to the UE the user data which was carried in the transmission that the host computer initiated, in accordance with the teachings of the embodiments described throughout this disclosure.
  • the UE executes a client application associated with the host application executed by the host computer.
  • FIG. 13 is a flowchart illustrating a method implemented in a communication system, in accordance with one embodiment.
  • the communication system includes a host computer, a base station such as an AP STA, and a UE such as a Non-AP STA which may be those described with reference to Figure 11 and Figure 10. For simplicity of the present disclosure, only drawing references to Figure 13 will be included in this section.
  • the host computer provides user data.
  • the host computer provides the user data by executing a host application.
  • the host computer initiates a transmission carrying the user data to the UE. The transmission may pass via the base station, in accordance with the teachings of the embodiments described throughout this disclosure.
  • the UE receives the user data carried in the transmission.
  • FIG 14 is a flowchart illustrating a method implemented in a communication system, in accordance with one embodiment.
  • the communication system includes a host computer, a base station such as an AP STA, and a UE such as a Non-AP STA which may be those described with reference to Figure 11 and Figure 10.
  • a host computer receives input data provided by the host computer.
  • the UE provides user data.
  • the UE provides the user data by executing a client application.
  • the UE executes a client application which provides the user data in reaction to the received input data provided by the host computer.
  • the executed client application may further consider user input received from the user.
  • the UE initiates, in an optional third sub step 3630, transmission of the user data to the host computer.
  • the host computer receives the user data transmitted from the UE, in accordance with the teachings of the embodiments described throughout this disclosure.
  • FIG. 15 is a flowchart illustrating a method implemented in a communication system, in accordance with one embodiment.
  • the communication system includes a host computer, a base station such as an AP STA, and a UE such as a Non-AP STA which may be those described with reference to Figure 11 and Figure 10.
  • the base station receives user data from the UE.
  • the base station initiates transmission of the received user data to the host computer.
  • the host computer receives the user data carried in the transmission initiated by the base station.

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Abstract

L'invention concerne un procédé mis en œuvre par un équipement utilisateur (UE) pour gérer un bloc de signal de synchronisation (SSB) à partir d'un nœud réseau dans un réseau de communication sans fil. L'UE fonctionne avec une bande passante réduite. L'UE détecte (301) un SSB provenant du nœud réseau, ainsi que le fait qu'une bande passante du SSB est supérieure à la bande passante de l'UE. L'UE détermine (302) quelle partie du SSB omettre pour que la bande passante du SSB soit égale ou inférieure à la bande passante de l'UE, de façon à ce que l'UE soit capable de recevoir le SSB. La partie du SSB à omettre est déterminée d'après une performance de décodage prédite du SSB.
PCT/SE2023/050334 2022-05-18 2023-04-12 Équipement utilisateur, nœud réseau et procédés de gestion de blocs de signal de synchronisation dans un réseau de communication sans fil WO2023224525A1 (fr)

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OPPO: "Simulation and evaluation for RedCap enhancement", 3GPP DRAFT; R1-2203996, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20220509 - 20220520, 29 April 2022 (2022-04-29), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052153301 *
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